I have the same launcher, I just make sure to oil the threads on the ASA every now and then.
as for the rockets, i haven't had any fins fly off yet. I did have some cracking on the foam between the head and the fins but I wrapped that part in electrical tape to help that. Maybe its dialed up too high?
Paintball Explosion PE LV1
PE Pants, chest armor, gloves
Virtue Spire 260, Vio w/Emerald Lense
HK Shredder Cleats